Lenovo released a basic non-customized, region-independent Vanilla version of Android 4.03 aka Ice Cream Sandwich for IdeaPad K1 customers who want to get rid of Honeycomb.
This release is generally not recommended for the casual or mainstream user who is unfamiliar with the Android OS and customizing it. The source code, which may be of additional value to the developer community, will be made available shortly. Further OTA updates are not planned for this release.
Vanilla ICS image Installation guide (for Windows user)